Embroidering-machine.



K. E'GGART.

EMBROIDERING MACHINE,

APPLICATION FILED Imm, 1914.

Patented Jan. 5, 1915.

2 SHBBTS-SHEET 1.

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"HE MORRIS PETERS CO., PHUTo-LITHH., WASHINGTON, D C

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K. BGGART. EMBROIDERING MACHINE.

APPLICATION FILED FEB, 3, 1914- Ll., Patented JaIL, 1915.

2 SHEETS-SHEET 2.

THE NoRR/S PETERS Co v PHOTOLITHQ. wAsHlNroN. Dv C.

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KARL EGGART, 0F ARBON. SWITZERLAND, ASSIGNOR T0 THE FIB-IVI 0F ADOLPH SAUBER, OF ABBON, SVITZERLAND.

EMBRODERING-MACHINE.

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Application led February 3, 1914.

T0 (17210710177. it mny/ concern:

Be it known that l, KARL Ecoan'r, a citi- Zen of the Republic of Switzerland, residing in Arbon, Switzerland, have invented certain new and useful Improvements in Embroidcring-Machines, of which the following is a specification, reference being had to the accompanying drawings, which form a part hereof.

This invention relates to the suspension and counter-balancing of the work frames oil embroidering machines and especially of automatic or jacquard embroidering machines. ln such machines the work frames are sometimes counter-balanced by weights and sometimes by springs.

The present invention is concerned particularly with the counter-balancing of the work trame by a spring and it has Jfor its object to provide simple and eliective means for eoualizing the counter-balancing Jforce exerted by the spring throughout the range ot' movement ot the work trame. regardless ot the variation in the tension of the spring. The counter-balancing spring is necessarily very stif'l1 and as the range ot movement of the work Jframe is considerable. the tension ot the spring, whether ot' one -form or another, varies considerablv at the extremes ot movement. It may happen. therefore, that it' the frame is properly counter-bal anced at one extreme ot' its movement it may be either over-balanced or under-balanced, as the case may be. at the other extreme position. The result is an impairment of the quality of the embroidery produced.

ln accordance with this invention the difiiculty is overcome and uniform counterbalancing of the frame in all positions is secured by varying the effective length ot the lever arm through which the spring acts upon the suspension system, or, .in other words, in varying the leverage through which the spring so acts, with the tension ofthe spring. That is, when the work frame is at one extreme position and the tension of the spring is at its minimum the leverage upon the suspension system through which the spring acts is minimum and its applied force is greater, and when the :trarne is at the opposite extreme and Speccation of Letters Patent.

Patented Jan. 5, MM5.,

serial No. 816,145.

the tension of the spring is at its maximum the leverage through which the spring acts 1s at its maximum and its applied `force is less. Thereby the counter-balancing force delivered to the suspension system from the spring is substantially equalized and uniform throughout the range of movement ot' the frame.

rl`he invention will be more fully explained hereinafter with reference to the accompanying drawings in which it is illustrated and in which- Figure l is a view in front elevation of the frame ot' an embroidering machine with its work irame, suspension levers and connections to the counter-balancing spring` and to the jacquard or automat. Fig. 2is a view of the same in end elevation as seen from the right hand in Fig. l but on a larger scale. Fig. 3 is a view in front elevation of the parts shown in Fig. 2 and on the same scale as Fig. 2.

The present improvements. so tar as they relate to the counter-balancing ot' the work frame, may be employed with various s vstems of trame suspension, but for purposes ot' illustration of the invention they are shown in the accompanying drawings and will be described herein as employed in connection with a system of frame suspension such as that which is made the subject ot anotherl application for Letters Patent of the United States tiled concurrently here with Serial No. 816.146. Thissystem of suspension will he described as far as may be necessary to enable the application of the present improvements to be understood clearly.

ln the drawings the jacquard or automat, indicated generally at l.'is shown as having a shaft 2 provided with a beveled gear 8 which meshes with a beveled pinion 5 on a vertical screw shatt t supported at its upper end by a bracket 9. On the screw shaft is a traveling sleeve or nut G which engages a rod 7 pivotallv connected at its upper end to the suspension lever l0 which is pivotally mounted at 1l on the machine frame 8 and to the horizontal arm ot' a three-armed lever 12 which is pivotally mounted at 13 on the machine frame 8L The upper arm of the threefarmed lever l2 is connected by a tension member 14 with the bell crank suspension levers 15 (one or more) suitably distributed and supported upon the machine frame. The lower arm of the three-armed lever 12 is connected by a tension member 16 with a substantially vertical arm 17 which is secured to a shaft 21 mounted in brackets 25 26 secured to the machine frame 8. The shaft 21 also has secured thereto an arm 22 which is connected by a tension member 23 with the suspension system, as through one of the suspension levers 15. The arms 17 and 22 With the shaft 21 constitute a. lever through which not only is the suspension system connected, for movement in one direction, to the jacquard or automat, through the medium of the three-armed lever 12, but through which the counter-balancing force of the compensating spring hereinafter referred to is also applied to the suspension system and therefore to the Work frame 36.

The tension members 14 and 16 are shown as supported at intermediate points, as at 18, 19 and 20, to prevent sagging. Also mounted in the brackets 25 26 is a shaft 27 which may have secured thereto a worm gear 28 for engagement by a worm 29 suitablv supported by the bracket 25 and provided with a squared shaft for convenient engagement b v a kev or wrench for the purpose of adjusting thetension ofthe counterbalancing spring 31, which has one end secured to the gear 28. as at 32, and the other end secured. as at 33, to a tension arm 34 through which the counter-balancing' force of the spring is communicated to the lever arm 17. The shafts 2l and 27 are relatively displaced or eccentricallv mounted. with the shaft 21 on that side of the shaft 27 toward which the tension arm 34 moves with increasing tension of the spring' 31. Provision is made for operative connection between the tension arm 34 and the lever arm 17. such that when the tension arm 34 moves in ay direction to increase the tension of the spring 31 the leverage through which the spring acts upon the suspension svstem is decreased. and vice versa. This result is convenientlv accomplished by 'mounting the tension arm 34 and the lever arm 17 as described and providing the tension arm 34 with a bearing surface 35 for engagement bv a roller 24.- carried by the lever arm 17, so that the tension arm and the lever arm have a movable or shiftingpoint of engagement and that the effective length of the tension arm varies with the position of the tension arm and therefore with the tension of the spring 31. The bearing surface is preferablv straigl'lt and nearlv radial with respect to the axis of the tension arm as shown. lf it be assumed that the work frame is in its median or normal position, as indicated in the drawings, it will be seen that the spring 31 counter-balances the frame, acting upon the suspension system with an effective leverage which is constant for that position of the parts. If the work frame is then moved downward by the operator, if the machine is a pantograph machine. or bv the jacquard or automat in the machine shown, the lever arm 17 will be swung to the left in Fig. 3, carrying with it the tension arm 34. This movement increases the tension of the spring 31 and the frame would therefore be over-balanced but for the fact that the roller 21 of the level' arm 17 travels outwardly on the bearing surface 35 of the tension arm 34. bv reason of the relative displacement of the lever arm and tension arm so that, while the tension of the spring 3l is increased the leverage through which it must then act upon the suspension system is increased and the counter-balancing force therefore remains substantially constant. It will also be seen that if the work frame 36 is moved upwardlv the lever arm 17 will be moved to the right. the tension arm 34C will also move to the right and the tension of the spring 31 will be decreased. but the roller 24 will move inwardly on the tension arm 34 and the leverage through which the counterbalancing spring then acts will therefore be decreased so as to compensate for the decrease of tension and the counter-balancing force delivered hv the spring to the suspension system will remain practically constant.

I claim as mv invention 1. Tn an embroiderineY machine. the combination of a machine frame. a work frame, an interconnected suspension svstern including a lever arm through which the counterbalancing force is applied. a counterhalancing spring. a tension lever moving with the spring. said tension lever and lever arm having` the one a suhstantiallv radial hearing surface and the other a bearingr on such bearing surface. and devices wherehv the levera ge through which the tension arm acts upon the lever arm is varied with the varyins!l tension of the spring. i

2. Tn an emhroidering machine. the cornbination of a machine frame. a work frame, an interconnected suspension svstcm including a lever arm through which the counterbalancing force is applied. a counter-halfuuring spring and a tension arm moving with theI spring and operativelv engaged with said lever arm` the lever arm and the tension arm being mounted on separate axes and having a movable engagement the one with the other.

3. Tn an embroidering machine. the coinbination of a machine frame. a work frame, an interconected suspension svstem including a lever arm through which the counterbalancing force is applied, a coiled counter- 1,123,5oe m balancing spring, and a movable tension This specifcation signed and witnessed arm engaged by the spring and having a this 15th day of January, A. D. 1914. bearing surface, the lever arm and the'tension arm being mounted on separate axes KARL EGGART' 5 and the lever arm carrying a roller for en- Signed in the presence ofgagement With the bearing surface of the EUGENE NAEL,

tension arm. D. ll. MURPHY.

Copies o1 tl patent may be obtained for live cents each, by addresing the Commissioner of Printencs` Waahinton, E. C.

It is hereby Certified that the name of the assignee in Letters Patent N o. 1,123,504, granted '@lftnueu'y 5, 1915, upon the application of Karl Eggert, of Arbon, Switzerland, for an improvement in Embroidering-Machines, was erroneously Written and printed as the iirnn of Adolph Saurer, Whereas said name should have been Written and printed as Firma AdoZp/L Saurer, as shown by the records of assignments in this Olce; and that the said Letters Patent should be read With this correetion' therein that the same may conform to the record of the ease in the Patent Oiice.

Signed and sealed this 16th day of March, A. D., 1915.

J. T. NEWTON,

Acz'ng 00mmz'ssz'fmevt of Patents.

[SEAL] 

